Roll the end of your cotton cord into a small spiral, as shown.
Place the spiral under the presser foot of the sewing machine, with the tail of cord coming toward you on the right. Set the machine to a long, wide zig zag and begin to sew, securing the tail of the cord to the spiral.
Step every few stitched to rotate the spiral under the presser foot. You are sewing around in a circle to add more cord to the spiral. Make sure the zig zag is catching both the new cord on the right and the edge of the spiral on the left. As the spiral gets bigger it will become much easier to maneuver and you will not need to stop sewing to rotate it.
Continue sewing until the base is the size you'd like. Then use your left hand to lift the left side of the spiral (the base) about 45 degrees. Sew all the way around once or twice.
Then lift the left side of the base as high as you can, until it touches the sewing machine. Continue sewing. This will create the walls of the bowl.
When the bowl is as large as you'd like, clip the excess cord with about 6 inches left. Cut the end of the cord at an angle, and loop it up, sandwiching it in between the cord at the presser foot. Sew down toward the left, securing the end of the cord to the bowl and creating a loop. Sew backwards, then sew down toward the right, securing the other side of the loop. (Where to sew is marked by pink zig zags on the photo.) Backstitch to secure the thread, then remove the bowl from the machine and clip any threads.